Door and brake control device



7 Oct. 14, 1930. F. B. THOMAS DOOR AND BRAKE CONTROL DEVICE Filed May10,, 1928 INVENTOR 5- RANPX B THOMAS BY Q/I/Q/ ATTORNEY I Patented Oct.14, 1930 HOUSE AIR BRAKE COMPANY, F WILMERDING, PENNSYLVANIA, ACORPORATION.

UNITED STATESPATENT; OFFICE FRANK B. THOMAS, OF WILKINSBURG,PENNSYLVANIA, ASSIGNOR TO THE WESTING- OF PENNSYLVANIA DOOR AND BRAKECONTROL DEVICE Application filed May 10,

This invention relates to car door and brake controlling devices, andmore particu- -larly to an electro-pneumatically controlled door andbrake'controlling equipment.

One object of my invention is to provide a ;car door and brakecontrolling equipment in which a passenger on the car may prevent therelease of the brakes under certain con- Q, ditions.

videa door and brake controlling equipment Another object of myinvention is to prohaving means under the control of a passenge'r forcontrolling the openingor closing of a car door and the release of thebrakes.

- Other objects and advantages will appear .in the following moredetailed description of the invention.

Inthe accompanying drawing; Fig. 1 is a diagrammatic view, partly insection, of a car door and brake controlling equipment embodying myinvention; and Fig. 2 a diagrammatic development of the door and brakecontrolling switch and brake valve device.

As shown inthe drawing, the equipment may comprise a combined brakevalve and brake switch device 1 for controlling the car doors and thebrakes, preferably similar to that disclosed in the pending applicationof Joseph C. McCune, Serial No. 235,450, filed No,vember 25, 1927.

The equipment includes an emergency valve device 2 comprising a casinghaving a piston chamber 3 connected to anemergency brake-pipe 4 andcontaining a piston 5 and a valve chamber 6 connected to the usual mainreservoir 7 and containing a slide valve Sadapted to be operated bypiston -5.

For'controlling the brakes electrically, a service magnet 9 and arelease magnet 10 are provided. The service magnet 9 is adapted 1928.Serial No. 276,597.

the outer end of which is connected a rod 21 for operating the car door.

The supply and release of fluid under pressure to and from the pistonsand 16 is controlled by a rotary valve 22 and said valve is operable bya piston 23 having a stem 24:

which is connected to the valve by an arm or lever 25.

A spring 26 urges the piston 23 in one direction and the supply andrelease of fluid under pressure to the opposite side of the piston iscontrolled by a magnet valve device comprising a magnet 27 and doublebeat valves 28 and 29 adapted to be operated by said magnet.

The circuit of magnet 27 is controlled by a treadle 30 adapted to bedepressed by a passenger entering or leaving the car and normally heldin a position to open the magnet circuit by a spring 31. The circuitwire 32 of magnet 27 leads to a contact finger 33 in the door and brakecontrolling switch and the circuit wire 32 is also adapted to beconnected to a' current supply wire 34 by the operation of a switchmember 35 which is carried by a rod 36, operatively connected to thelever arm 20.

' The circuit wire 37 for the release magnet 10 is connected to acontact finger ,38 in the door and brake switch and connection of thecircuit wire 37 to the magnet 10 is controlled by the switch member 35.The circuit wire 39 of the service magnet 9 is connected to a contactfinger 40 in the door and brake switch.

A current supply wire 41 is connected to a contact finger 42.

In operation, when the brake valve and brake switch device is in releaseposition, the

contact fingers42, 38, and 4.0 engage electrically connected contacts48, 44, and 45, so that current is supplied from the current supply wire41 to the release magnet wire '37 and the service magnet wire 39.

The service magnet 9 is therefore energized, so that the valve 11 isheld seated,

while the valve 12 is held unseated. With the valve 12 unseated, fluidunder pressure is supplied from the main reservoir 7 through passage 46to the emergency brake pipe 4. The valve chamber 6 being open to themain reservoir 7 and the piston' chamber 3 being supplied With fluidfrom the main reservoir, the fluid pressures on piston 5 are balanced,permitting the spring 47 to maintain piston 5 5 in its normal releaseposition. as shovvnin the drawing i 7 Thetreadle 30 not being depressed,the

circuit of magnet 27 is open, so that magnet 27 is deenergized,permitting thevalve 29. to

I Wlll not e tllect seat and t-lie val ve 2 8 to be unseated.

I With the valve 28 unseated, the piston chamber above piston 23 isvented to the atmosphere through port 48.,lfperr'nitting the spring 26to maintain piston 23 in its upper position, as shown in thedraW-in'g-Qadapted to connect a passage 49, leading to 'lnthis position, the rotaryvalve 22 is piston 15, through a cavity50 in thelvalve, With an exhaustport 51, While a passage 52,

. flea-ding to piston 16, is connected through cavity 53 Witha iiuidpressure supply pas sage 54;. V The pistons 15 and 16 are thereforemaintained in their upper positions, by fluid pressure acting on piston16. in which position the car doorscontrolled by the rod 21 are heldclosed VJith the car doors held closed, the rod 36' holds the contactmember 35'so as to close the circuit from the release magnet v. wire 37to the release magnet 10 and with brake valve and brake switch inrelease position, the release magnet 10 is energized and the releasevalve 18 is held open. The emergency slide valve 8being in releasepositiomthebrake cylinder is connected to the'atmosph'ere throughpassage 56. cavity 57 in slide valve 8, passage 58, past the openvalve13', to'passage 59, cavity in slide valve 8 and exhaust port 61.

In'the release position of the brake switch, the circuit Wire 32 is notsupplied with electric current, so that even if the treadle 30 Weredepressed by a passenger on the car, current Would not be supplied toenergize the 45 magnet 27.

If the operator Wishes to eiiect a service application of thebrakes'without opening the car doors. he moves the-brake switch toservice doors closed position. iii-Which current is not supplied to thecircuit Wires 3'? and i :39 and consequently, the magnets 10 and 9 aredeenergized. Release magnet 10 being Yf'deenergized, the valve 13 isseated, cutting 05' the exhaust from the brake cylinder 55 and theservice magnet 9 being deenergized, the valve 12 is seated and the valve11- uniseated', so that fluid under pressure is supplied to the brakecylinder through passage 46, past the open valve 11 to passage 58 and Ythence through cavity 57 and passage 56 to the brake cylinder.

The car doors cannot be opened in this position, even ifa passengersteps on the treadle 30, since electric current is not sup- 6.5 plied inthis position to the circuit ire 32.

" causing the mass to beseated If the operator wishes to permit the cardoors to be opened, he turns the Drake valve and brake switch to theservice doors open position, in which an electric service applivalve 29unseated. I I I The unseating of valve 29, permits the iiow of fluidunder pressure fromthe main reser voi'r 7, 'hrough'plpeti l, past theopen valve 29 to pipe 65, so that the piston is moved by fluid underpressure and the rotary valve 22 is operated to cause cavity 53 toconnect passage 54: With passage 49 and to cause cavity 50 to connectpassage 52 with exhaust-port 51. v Fluid under pressure is then suppliedto piston 15 While piston 16 isvented to the atmosphere and consequentlythe tons l5 and 16 are shifted downwardly, ca ing the rod 21 to'beoperated so as to effect the open ing of the car doors. I

to the The movement to open the car doors also 1 causes the rod 36, tobe shifted, so that the circuit from Wire 37 to the release magnet 10is'opened, While the contact member 35 operates to close a circuit fromcurrent supply Wired l to the circuit Wire 32.

the car operator should attempt to close the car doors or release thebrakes, he cannot do so, as long as a passenger holds the treadle 30depressed, S111C6'Wltl1 theytreadle depressed, current is supplied fromthe current supply Wire 3 t to energize the magnet 27, even though thecircuit'oithe Wire 32 is opened at the brake svvitchby the operator.

The door being opened, the circuit from Wire 37 to the release magnet10' is'held open,

so that the operator Will be unable to energlze: the release .lnagnet lOby. movement of the brake switch to release position: I Vii hen there sno passenger holding the treadle 3O depressed, the magnet EZTWill bedeenergized and the valve 29 Will'be seated and the valve 28 unseated.The piston 23 is then vented to the'atmosphere, and the-rotary valve 22is moved byfthepiston 23" to the doors closed position, in Which, fluidunder pressure is supplied to piston 16 While piston 15 is vented to theatmosphere: 3

The pistons 15 and 16 are thererore shifted to their upper positions, bywhich movement,

the rod 21 is operated to close the car doors. The movement to close'thecar doors, causes the rod 36 to be shifted so that the contact member 35closes the circuit from the release circuit Wire 37' to the releasemagnet 10. The

operation of the emergency valve device 2,

to effect an emergency application of the brakes. In emergency positionof the brake switch, current is supplied through connected contacts 66and 6'? to the circuit wire 32, so that when a passenger depresses thetreadle 30, the magnet 27 is energized and the car 7 doors are opened,in the same manner as de scribed in connection with the movement of thebrake switch to the serv ce doors open povsition.

While one illustrative embodiment of the invention has been described indetail, it is not my intention to limit its scope to that embodiment orotherwise than by the terms of the appended claims. I

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. The combination with a door engine having pistons operated by fluidunder pressure for controlling a car door, of: electrically controlledmeans for controlling the release of the brakes and means operativelyconnected to said pistons for preventing the opera tion of saidelectrically controlled means to efiect the release of the brakes uponmovement 01" said pistons to effect the opening of the door. 2. Thecombination with a door engine for controlling the opening and closingof a car door, of electrically controlled means operated upondeenergization for cutting oii" communication through which fluid isreleased for effecting the release of the brakes and means operated uponmovement of said door engine to open the car door for effecting thedeenergization of said electrically controlled means.

3. The combination with a door engine for controlling the opening andclosing of a car door, of a magnet valve device adapted uponenergization to effect the release of the brakes and upon deenergizationto prevent the release of the brakes and a switch device associatedwith'said door engine for controlling the circuit of said magnet valvedevice.

4. The combination with a door engine for controlling the opening andclosing of a car door, of a magnet valve device adapted uponenergization to effect the release of the brakes and upon deenergizationto prevent the release of the brakes, and a switch device operated whenthe door engine is in position for closing the car door for closing thecircuit of --said magnet valve device and when the door engine is inposition for opening the car door controlling a car door, of a magnetvalve device for controlling the operation of said door engine, a magnetvalve device for controlling the release of the brakes, and meanscontrolled by said door engine for controlling the circuits of saidmagnet valve devices.

6. The combination with a door engine for controlling a car door, of amagnet valve device ior controlling the operation of said door engine, amagnet valve device for controlling the release of the brakes, and aswitch device operating with said door engine for controlling thecircuits of said magnet valve devices.

7 The combination with a door engine for controlling a car door, of amagnet valve device for controlling the operation of said door engine, amagnet valve device for controlling the release of the brakes, and aswitch device adapted in the door closing position of said door engineto close the circuit to the brake release magnet valve device and openthe circuit to the door engine controlling magnet valve device and inthe door opening position of said door engine to open the circuit to thebrake release magnet valve device and to close the circuit to the doorengine controlling magnet valve device.

In testimony whereof I have hereunto set my hand.

FRANK B. THOMAS.

